How does reality being racist imply that a fact is racist? And not other things? Is everything racists under a racist reality? How do we draw these lines?
Let me be more concrete and give an example.
Blacks living in the U.S. have (in a statistical average sense) a higher sensitivity to sodium than whites, leading to higher rates of hypertension in that demographic. If you're a physician treating black patients or you're a black American yourself, this is an important fact to know. This is a racist fact, because it differentiates reality along racial fault lines.
There are plenty of examples of situations where I could get you to say that one course of action is the rational or best option, but if I keep the same logical structure and swap out some nouns and adjectives, what was once the best option is now racist, and I'm a racist if I take this course of action. I won't give any examples because they're too inflammatory, and I don't feel like getting downvoted into oblivion. I'm pretty sure you can fill in the blanks if you're so inclined.
Since realizing this, I no longer view "racist" as a derogatory. It's the way the world already is, so my choice is either to have an accurate view of reality or an impoverished one.